<?php

require_once 'HTMLPurifier/Injector.php';

HTMLPurifier_ConfigSchema::define(
	'AutoFormat', 'Linkify', false, 'bool', '
<p>
  This directive turns on linkification, auto-linking http, ftp and
  https URLs. <code>a</code> tags with the <code>href</code> attribute
  must be allowed. This directive has been available since 2.0.1.
</p>
');

/**
 * Injector that converts http, https and ftp text URLs to actual links.
 */
class HTMLPurifier_Injector_Linkify extends HTMLPurifier_Injector
{
	
	var $name = 'Linkify';
	var $needed = array('a' => array('href'));
	
	function handleText(&$token) {
		if (!$this->allowsElement('a')) return;
		
		if (strpos($token->data, '://') === false) {
			// our really quick heuristic failed, abort
			// this may not work so well if we want to match things like
			// "google.com", but then again, most people don't
			return;
		}
		
		// there is/are URL(s). Let's split the string:
		// Note: this regex is extremely permissive
		$bits = preg_split('#((?:https?|ftp)://[^\s\'"<>()]+)#S', $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
		
		$token = array();
		
		// $i = index
		// $c = count
		// $l = is link
		for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
			if (!$l) {
				if ($bits[$i] === '') continue;
				$token[] = new HTMLPurifier_Token_Text($bits[$i]);
			} else {
				$token[] = new HTMLPurifier_Token_Start('a', array('href' => $bits[$i]));
				$token[] = new HTMLPurifier_Token_Text($bits[$i]);
				$token[] = new HTMLPurifier_Token_End('a');
			}
		}
		
	}
	
}

